Good article on 'nominalisation', which doesn't just complain about conversion, but distinguishes it from affixations and explores the motivation for using a noun instead of a verb.
Those Irritating Verbs-as-Nouns
http://opinionator.blogs.nytimes.com/2013/03/30/those-irritating-verbs-as-nouns/
Those Irritating Verbs-as-Nouns
http://opinionator.blogs.nytimes.com/2013/03/30/those-irritating-verbs-as-nouns/